According to the twelve meridians's blood gas running time, Yin Shi's blood gas flows into the lungs at 3: 00 a.m. to 5: 00 a.m., which is called "Hand Taiyin Lung Meridian". It's time for the respiratory system to work. This period of time is the slowest period of blood circulation, breathing and heartbeat, and it is also the period of high incidence of hypertension, stroke and heart disease. People with poor lung function are prone to allergic rhinitis, cough and asthma in the early morning; Doctors believe that patients with severe asthma will get up and take medicine at this time, and the treatment effect will be better. 13 ~ 15 Wei's qi and blood flow into the small intestine, which is called "Hand Taiyang Small Intestine Meridian" and the small intestine runs. Therefore, it is best to eat lunch in the afternoon 13, when the small intestine meridian is turbid and absorbed, nutrients are absorbed into the body, and turbid substances are sent to the large intestine for digestion and elimination. After exhaling, the stomach begins to rest. Therefore, 3-5 points have the best effect, and 13- 15 points have the best absorption.